Mothproofing composition



Patented July 12, 1938 UNITED STATES areas-1a MO'IHPROOFING COMPOSITIONHenry Martin and Rudolf Hirt, Basel, Switzerland, assignors to the ilrmI. It. Geigy S. A.,

Basel, Switzerland No Drawing. Application May 1, 1937, Serial 8 Claims.

According to the present invention, textiles and other materials liableto damage from moths are rendered moth-proof by treating them withmixtures or solutions ot'thianthrene and its derivatives andsubstitution products. These agents are used in the manner customary forinsecticides.

Many compounds of the thianthrene series suitable for use intheinvention are known. The

following are some of them; they are given by way 01' example and theinvention is not limited to their use:

, Thianthrene or 2:6-dimethylthianthrene (Berichte, Vol. 29, pages 437-81:3:527-tetramethylthianthrene (Berichte, Vol. 22, page 910);2-chlorothianthrene or 2:7-dichlorothianthrene (Annalen der Chemie, Vol.381, pages 327 and 329) 2:7-dichloro-3z6 dimethyl thianthrene, 4:5dichloro 1 :8 dimethylthianthrene, thian- 2 threnedicarboxylic acid ordimethoxythianthrene (Chem. Zentralblatt, 1922, Vol. I, page 818): 2 3 z6 7-tetramethoxythianthrene (Annalen der Chemie, Vol. 468, pages162-201, Chem. Zentralblatt, 1929, Vol. I, P ge 1944) dinitrothianthrene25 (Bull. de la Soc. Chimique de Paris, Ser. 3, Vol.

15, page 423); 3-nitro-6-methylthianthrene, 3-nitro-8-methoxy-5-methylthianthrene, 8-chloro- 3-nitrothianthrene,5:8-dichloro-3 nitrothianthrene or 3-amino-6-methvlthianthrene hydro- 30chloride (Chem. Zentralblatt, 1924, Vol. I, pages 1035-8);thianthrenesulphonic acid (U. S. Specification No. 1,589,390 and Chem.Zentralblatt, 1927, Vol. 1, page 360) naphthianthrene (Berichte, Vol.42, page 1175) and so on, also the S- 35 oxides of the above compounds,for example:

Thianthrene-S-oxide (Annalen der Chemie. Vol. 381, page 321);thianthrene-S-dioxide (Berichte, Vol. 44, page 758);thianthrene-monosuiphone (Annalen der Chemie, Vol. 381, page 823) 4othianthrene-di-sulphone (Berichte, Vol. 29, page 442);2:6-dimethylthianthrene-S-oxides (Berichte, Vol. 42, page 1174);2:3:8z7-tetramethoxythianthrene-S-oxides (Annalen der Chemie, Vol. 468,pages 162-201, and Chem. Zentralblatt,

45 1929, Vol. I, page 1944) and so on, or thianthrene- S-disulphides,for example 3:7-dimethoxy-2z6- dioxythianthrene disulphide (Chem.Zentralblatt, Vol. II, page 898) and the like.

The aforesaid thianthrenes are excellently suit- In Switzerland May 9,1936 ed, for example, for protecting wool, hair, fur, feathers and thelike by impregnation from damage by moths. Even when used in very smallconcentrations they impart a suflicient protection to the treatedmaterials. In practice they 5 will be used principally in the form ofsolutions in water or cheap organic solvents such as hydrocarbons,chlorinated hydrocarbons. alcohols, ketones or the like, or mixturesthereof. The goods to be protected may be treated by brush- 1o ing orspraying or impregnated by immersion. Furthermore, the thianthrenes maybe emulsifled in oils, fats or creams, or they may be used as additionsto powders and, indeed, in all the i'orms usual for insecticides. Theymay likewise 15 be used in combination with other agents already knownfor the same purpose.

The following example illustrates the invention, the parts being byweight:-

parts of thianthrene or another-of the com- 20 pounds above-named, suchas dimethylthianthrene, dichlorodimethylthianthrene orthianthrene-S-oxide, are dissolved in 980 parts of alcohol. Furs,feathers or wool are immersed in the solution and then centrifuged anddried. The

goods thus treated are immune from damage by moths. Even more dilutesolutions sumce to impart a satisfactory protection.

What we claim is 1. A moth-proofing composition containing as itsessential active ingredient a thianthrene.

2. A moth-proofing composition containing as its essential activeingredient a thianthrene-S- oxide.

8. A moth-proofing composition containing as its essential activeingredient a thianthrene substituted by at least one halogen atom.

4. A moth-proofing composition containing as its essential activeingredient thianthrene-S-. oxide.

5. A moth-proofing composition containing as its essential activeingredient dichloro-thianthrene-S-oxide.

6. A moth-proofing composition containing as its essential activeingredient dichloro-thianthrene.

HENRY MARTIN. RUDOLF H'm'r.

